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1. United States Major Parks, 2012

1992. National Park Service, Environmental Systems Research Institute (Redlands, Calif.), and TomTom North America, Inc. United States Major Parks is a polygon theme representing National Parks, National Forests, State and local parks and forests within the United Sta... Esri.

2. United States Non-Attainment Areas: Carbon Monoxide, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Carbon Monoxide is a polygon theme representing areas in the United States that do not meet the National Ambient Air Quality ... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

3. United States Non-Attainment Areas: Lead, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Lead is a polygon theme representing areas in the United States that do not meet the National Ambient Air Quality Standard fo... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

4. United States Non-Attainment Areas: Nitrogen Dioxide, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Nitrogen Dioxide is a polygon theme representing areas in the United States that do not meet the National Ambient Air Quality... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

5. United States Non-Attainment Areas: Ozone, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Ozone is a polygon theme representing areas in the United States that do not meet the National Ambient Air Quality Standard f... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

6. United States Non-Attainment Areas: Particulate Matter 10, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Particulate matter 10 is a polygon theme representing areas in the United States that do not meet the National Ambient Air Qu... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

7. United States Non-Attainment Areas: Particulate Matter 2.5, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Particulate matter 2.5 is a polygon theme representing areas in the United States that do not meet the National Ambient Air Q... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

8. United States Non-Attainment Areas: Sulfur Oxides, 2008

2008. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) and Federal Highway Administration, Office of Planning, HEPP-1. Non-Attainment Areas: Sulfur Oxides is a polygon theme representing areas in the United States that do not meet the National Ambient Air Quality St... Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS).

9. United States Parks, 2010

2010. Tele Atlas North America, Inc. and Economic and Social Research Institute (Reston, Va.). United States Parks is a polygon theme representing parks and forests within the United States at national, state, and local levels. Attribute info... ESRI.

10. United States Parks, 2012

2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). United States Parks is a polygon theme representing parks and forests within the United States at national, state, and local levels. Attribute info... Esri.